Mira noted with much satisfaction that her boyfriend's cock was visibly swelling and growing into his own mouth.
The lipstick's spell was bound to her, as the rightful owner of the item, and its effect seemed different for other people. While she was able to turn him almost completely female, Kieran as a cis dude seemed only able to enhance maleness, turning whatever his lips touched into something more virile - Mira's clitoris at first, which had grown into a penis, and now his own dick as he was self-sucking.
Mira kept Kieran's head down as he approached climax, forceing him to suck on and gulp down his own seed. Another magical tingle ran through his cock and it expanded frantically, escaping his lips as it throbbed wildly, thick veins appearing all around. Mira watched, fascinated, as her boyfriend's freed member grew inhumanly huge, perhaps as large as a horse's, and wide and ogreish in appearance.
"Please, help!" Kieran begged with a hint of lust in his voice, before letting out a lewd scream of pleasure as the monster member contracted strongly; a geyser of cum exploded from its glans, nearly hitting Mira and splattering the ceiling. Kieran let out a few high-pitched grunts as more cumshots hit a wall, the desk, and the carpet in the middle of the room.
When he could finally catch his breath, Mira took a tissue and wiped the cum and lipstick off his mouth and dick as it was softening. It looked grotesque even at rest, perhaps a foot of ogreish meat, with a powerful virile scent emanating from it; Mira found the sight appealing, though the member looked totally out of place on such a girlish frame. Kieran was about her height at this point, only skinnier and with larger breasts, like the photoshopped models on popular magazines.
The only difference was the veiny behemoth between his legs, contrasting starkly with the soft skin of his feminine thighs.
"Not really an improvement for you now, is it? That serves you right for being such a naughty girl." Mira picked up the lipstick and put it safely in her pocket. After a moment of reflexion, she took Kieran's hand and encouraged him to get up. His monster cock dangled ungracefully between his legs.
"I think we should go out on a belated birthday date today, so here's some clothes for you to wear until we buy you something that fits better..."
Mira rumaged through her drawers and picked a few clothing items, helping Kieran as he slid them on. She opted for no underwear as none would fit, but found a nice flowing summer dress that would hide his bulge as much as possible. The dress had many folds and Kieran hoped his mammoth member wouldn't jut the fabric too visibly forward when walking.
None of Mira's bras would fit her boyfriend's ample bossom so he went braless, his delicate nipples poking through the fabric of the dress. Mira was slighty turned on and she felt her own penis stir a bit, tugging on the tape in her underwear.
"I think we're ready to hit the mall for a shopping session. You really need a bra Kiera," Mira added as she noticed with delight how bouncy Kieran's breasts were without support. She handed Kieran a purse and a pair of mid-wedge sandals that matched his outfit, and they exited their small flat, ready to face the outside world.